Fan



FIG. 1 is a perspective view of a fan;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines represent environment that forms no part of the claim. 

CLAIM The ornamental design for a fan, as shown and described. 